Pencil-sharpening machine.



No. ?92,785 I i PATENTBD JUNE 20, 1905.

P. P. O'VHORO. I PENGIL SHARPENING MACHINB.

APPLIGATION FILED APR.8,1905.

4 4 fl a aj? 0272 ro, 7 M ya W W NITED STATES Patented June 20, 1905.

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PATENT PENClL-SHARPENING NIACHINE.

SPECIFICATION forming part of Letters Patent No. '792,785, dated June20, 1905.

Application filed April 8, 1905. Serial No. 254:,5l8.

To all whom, it mcy cancer-n:

Be it known that I, PETER P. OHono, a citizen of the United States,resding at Chicago, in the county of Cook and State of Illinois, haveinvented a new and useful Improvement in Pencil-Sharpening Machines, ofwhich the following is a specification.

My invention relates to an improvement in pencil-sharpening machines ofthe class in which a rotary disk or cylinder provided with a series ofblades is employed, in connection with a holder, for the pencil to besharpened thereby;

The primary objects of my invention are to provide a Construction ofmachine in the class referred to which will efi'ect the sharpening of apencil without requiring constant 'eeding of it by hand against thecutting means and which will permit a pencil to be sharpened quickly andwithout unnecessary waste thereof.

Further objects are to provide a Construction of sharpener in which theholder for the pencil may be adjusted to produce any desired bevel uponthe end of the pencil, thus to avoid unnecessarily cutting it away, andto provide a machine which is easily operated and of simpleConstruction.

1 accomplish these objects by a construction wherein the pencil-holdingdevice, coperating with rotary cutting means, is journaled on the casingof the machine in a manner adapting it to rock and be resiliently heldagainst depression at any desired angle relative to the cutting device.

. My invention is illustrated in its preferred form in the accompanyingdrawings, in which- Figure 1 is a vertical section taken at the line 1on Fig. 2 viewed in the direction of the arrow and showing the positionof a pencil after the operation of sharpening has been completed, andFig. 2 is a section taken at the line 2 on Fig. 1 and viewed in thedirection of the arrow.

A denotes a casing having an opening (a in one side near its upper end,over which a oovering-p'late a is Secured, an opening co in the sameside near the bottom, through which a drawer A' for catching theshavings that drop from a pencil being sharpened is inserted to restupon a lug & centrally on the inner, surface of the opposite side of thecasing, and an opening a* in the top thereof, through which the pencilmay be observed when adjusted in position and undergoing the sharpeningoperation. Projecting from the side of the casing opposite the opening aon opposite sides of an opening a in the casing are similar ears (6 ofwhich only one is shown, owing to the nature of the view selected forillustration, and projecting from the top of the casing is a stop-lug (0An operating-shaft B is journaled in the upper part of the casing toproject beyond the opposite faces thereof and carries on one end a gearB' and a crank-handle B and on its opposite end a gear 13 Theoperating-shaft contains in its distal end, which is internallyscrew-threaded at 7), a chamber B, and into this end of the shaft isscrewed a plug Bi containing an opening b', through which the outer endof a plunger C projects, the plunger being confined in the chamber at ashoulder c on the plunger against a spiral spring C', housed therein.Thus the outer end of the plunger is constantly pressed against thepencil-holding device in its operation, as will be hereinafterdescribed.

D D are cutters, preferably of cylindr-ical form, journaled in thecasing A on shafts (Z d', respectively, above the shaft B andequidistant therefrom, the cutters being provided with cutting-blades (lformed thereon spirally, one being a right and the other a leftcutting-blade, the cutters being arranged in the casing in a manner tocause the spiral bladc of one to converge relative to that of the other,as shown in Fig. 2. Secured to the shafts (Z d', respectively, are gearsD D both meshing with the gear B to cause the cutters when thecrank-handle is operated to rotate in the same direction, but in adirection opposite to that of the crank-handle.

E is a pencil-holding device which in its preferred form comprises atubular head E journaled at its inner end between the ears (0 forpivotally mounting it on the casing to the rotary cutters.

adapt it to be rocked thereon. An arm 6 projects from the'under surfaceof the head E' and is engaged by the outer end of the plunger C, whichtends under the action of the spring C' constantly to force thepencil-holder toward its normally raised position. A'lug e, projectingfrom the top of the head E', is provided with a threaded opening 6 intowhich a stop-finger E threaded at one end and provided thereon with aretaining-nut 6 is screwed to be adjustable therein and adapt its freeend to abut against the lug (0 on the casing for regulating the limit ofrocking of the pencil-holder. J ournaled in the head E' and projectingbeyond its opposite ends is a tubular shell G, provided at one end Withan annular ofiset g, forming a shoulder g' on its outer surface,abutting against the outer end of the head, and at its other end With anexternal screw-thread g On the end of the shell G nearest to the frame Ais Secured a gear G' of larger diameter than the gears D? D and meshingwith the gear B to cause the 'rotary parts of the pencil-holding deviceto rotate with the cutters and in the same direction, but at a lowerrate of speed. The gear G' is provided on its inner face with a centralapertured boss gi having its inner face depressed to form a concaveinner surface. A holloW plug H, provided at one end With a milled headlb, having a central opening lt' therein, toward which the interior ofthe plug is roundingly contracted, as shown, to form a concave surfacesimilar to the one in the boss 9 screws into the enlarged end of thetubular shell G, the threaded connection of the plug with the shellpermitting the plug to be screwed in and out for the purpose hereinafterexplained; Housed in the shell G is a resiliently-collapsiblepencil-gripping chuck J which is bestformed of spring-steel by cut`-ting a series of slots in the wall of the cylinder from opposite endsthereof in staggered relation to each other and having enlarged endsbeveled on their outer edges to form tapering end bearings, whichengage, respectively, with the concave inner surfaces of the boss g andplug H; i When the plugis's crewed into the shell G to contract thechuck; the latter firmly grips and rigidly holds a pencil I insertedtherein to be sharpened'.

The operation of the machine is as follows: The pencil-holder is drawndown, rocking it upon its pivotal support against the resistance of thespring C', and'the end of the pencil to be sharpened is passed throughthe holder and the opening a in the casing t'o canse said end to bearmore or less horizontally against The pencil is then clamped within theholder by screwing the plug H into the shell G, thus causing the chuckto grip the pencil and hold it firnly in position. The sharpeningoperation is performed by turning the c rank B which, being geared tothe ro tary cutters and to the rotary parts of the pencil-holdingdevice, causes them to be rotated simultaneously and correspondingly tocut away the pencil about its end While rotating it. As the cutterstaper the pencil to- 'ward'itsend it sinks deeper and deeper into vingof the pencil to the cutters. Thus any superfluous turning of the crankafter .the pencil has been sharpened will 'not cause the pencil to becut away and wasted( 'i The adjustable stop-finger E afiords means forarresting the rocking of the holder at .dif-

ferent positions thus enabling the operator to set the machine' toproduce anydesired bevel upon the end of the pencil.

` By providing the two coperating cnttingcylinders instead of onecutter, as hitherto,

the sharpening operation s materially ,expedited and accordinglyfacilitated.

What I claim as new, and desireto secure by Letters Patent, is-` l. In apencil sharpening machine, the combination with the casing, of a 'pairof cooperating rotary' cutters and' a pencil-holding device' resilientlymounted on said casing to' rise a he enc l nd s g pr dby h ha i;- eningoperation and depress said end deeper d deeper betwee cut rs- 2. A pe cha pe na m chine cemprsing, incombination with a casing; a pair cope g"r tary u er j urhals d i i "th pas: ng. a t ry n il h d 'device mbante&on the casing to adapt* itto be`roc`ked,`mens for resiliently holdingsaid device against depre d n an r rgul tin fl .ext ft of r g' of l d vie; he pur os set form 'A nc -s ar en n mach ne ca pus.: ng` n' b a i n wth e c hg, 'a pair f '09: pe n vl ndrcal u t r each n qv'd d with'acutting-blade'forined spirally thereon and journaled in the asing torotate in the same drectio a pencil-holding device having. a tubularhead pivotally mounted on the c' ing, a shell journaled in said headandineans f' a el r' l sb r pin p ni and means for resiliently holdingdevice against depression, for the 'purpose set 'forth.

4.A pencil-sh rpehing machine compri ing, incornbination with a casing apair of cooperating cylindrical cutters each provided With aeutting-blade formed pirally` thereon and journaled in the casing' torotate in the same direction, a pencil-holding device having a u l h a pe el y empted 1 he IOO IIO

ing, a shell rotatably confined in said head and a contractible grippingmember confined in said shell, and means for resiliently holding saiddevice against depression, for the purpose set forth.

5. A pencil-sharpening machine comprising, in combination, a casing, ashaft journaled therein, rotary'cutters journaled in said casing, arotary pencil-holding device mounted on said casing to be rocke'dthereon, gear mechanisms connecting said shaft With said cutters andsaid pencil-holding dcvice, and a spring-actuated plunger in said shaftengaging said device to resiliently maintain said pencil-holding deviceagainst depression.

6. `In a pencil-sharpening machine, the combination With the casing, ofa pair of coperating rotary cutters, a rotatable pencil-holding devicemounted to rock on said casing and resiliently held against depression,a stop-lug in the casing and a stop-finger adjustably supported on saiddevice to engage said lug for regulating the eXtent of rocking of saiddevice.

7. A pencil-sharpening machine comprising, in combination With a casing,a pair of cylindrical cutters on shafts journaled in the casing, ahandle-equipped operating-shaft journaled in the casng and geared tosaid cutter-shafts to rotate them in the same direction, saidoperating-shaft containing a chamberin its distal end and carryingthereon a gear, a spring-pressed plunger confined in said chamber, and apencil-holding device having a tubular head provided with an armengaging said plunger and mounted on the casing to be rocked thereon, ashell rotatably supported in said head and carrying a gear meshing Withthe gear on said distal end of the operating-shaft, `a chuck confined insaid shell, and a hollow screw-plug Working in the outer end of saidshell against the chuck therein, for the purpose set forth.

8. A peneil-sharpening machine comprising, in combination With a casingprovided With a stop-lug, a pair of cylindrical cutters on shaftsjournaled in the casing, a handleequipped operating-shaft journaled inthe casing and geared to said shafts to rotate them in the samedirection, said operating-shaft containing a chamber in its distal endand carrying thereon a gear, a spring-pressed plunger confined in saidchamber, a pencil-holding de- Vice having a tubular head provided Withan arm engaging said plunger and mounted on the casing to be rockedthereon, a shell rotatably supported in said head and carrying a gearmeshing With the gear on said distal end of the operating-shaft a chuckconfined in said shell, and a hollow screw-plug Working in the outer endof said shell against the chuck therein, and a stop-finger adjustablysupported on said tubular head to engage said ,stoplug.

PETER P. UHORO.

In presence oli- W. B. DAvIEs, J. H. LANDES.

